Improvement in mechanical movements



J. BARNES & W. F. BARNES.

Improvement in Mechanical Movements. No. 114,514. Patented May 9,1871.

Wizzeasesn- [7206 22 ion UNITED STATES PATENT Orrrono JOHN BARNES ANDWILLIAM F. BARNES, OF ROCKFORD, ILLINOIS.

IMPROVEMENT IN -MECI-IANICAL MOVEMENTS.

Specification formingppart of Letters Patent No. 114,514, dated May 9,1871.

To all whom it may concern:

Be it known that we, JOHN BARNES and WILLIAM F. BARNES, both ofRockford, in the county of Winnebago and State of :Illinois, haveinvented certain new and useful Improvements in Mechanical Movements, ofwhich the following is a specification:

Our invention relates to such mechanical movements as are used forconverting an oscillating or treadle motion into a rotary motion, and ismore especially designed for driving scroll saws, hand'lathes, and suchlight machinery requiring little power but a quick movement.

The object of the first part of our invention is to provide a simple anddirect connection between the treadle and balance-wheel; and ourimprovement consists in combining a vibrating bifurcated treadle withdriving-belts passing in opposite directions around the pulley, and apulley actuated by the belts in alternately opposite directions, movingfreely upon its shaft, and carrying with it a lockinglever, whichoperates upon the grooved hub of a balance-wheel, as hereinafterdescribed.

The object of the second part of our invention is to secure a moreperfect connection between the pulley and the grooved hub of thebalance-wheel, so that the wheel may be impelled at a higher speed thanthat of the driving-pulley without being retarded by the action of thelocking mechanism; and the invention consists in a driving-pulleyrotating alternately in opposite directions, and a locking-lever havingone of itsends attached to and actuated by the driving-pulley, andprovided with an arm that projects into a groove and locks in a peculiarmanner with the hub of a balance-wheel, as hereinafter more fullydescribed.

Our invention further consists in combining a driving-pulley rotatingalternately in opposite directions, an axle, a grooved wheel, and alocking-lever, extending partly across the face of the wheel, so thatits ends are nearly diametrically opposite each other, and bent to avoidthe axle, in such manner that the axle forms a stop to limit themovement of the lever, as hereinafter more fully described.

In the accompanying drawing, Figure 1 is a side elevation of ourimproved mechanism;

Fig. 2, a detached view of the face of the driving-pulley and thelocking-lever, with the grooved hub of the balance-wheel shown in dottedlines; Fig. 3, a central longitudinal vertical section of our device;Fig. 4., a view, in perspective, of the driving-pulley and belts; Fig.5, a similar view of the locking-lever; and Fig. 6, a view, inperspective, of the hub of the balance-wheel-all the other figures beingupon a larger scale than that of Fig. 1.

A bifurcated treadle, A A, is pivoted to a bracket or upright, B,which-may usually be the frame of the machine. The diverging ends of thelevers A A, which form the treadle, are connected with a drivingpulley,O, by belts D D, which pass around the pulley in opposite directions, sothat the pulley is alternately moved in opposite directions by thevibrations of the treadle. The drivingpulley Cis journaled and turnsfreely upon a stud-axle, E, which is. secured upon the up-- right orframe of the machine. A flange, c, is formed upon the driviug-pulley,and encircles a part of the hubof the balance-wheel. A notch, 0 isformed in this flange to receive an arm, f, on the locking-lever, whicharm extends partly across the periphery of the hub of the balance-wheel,and a spring, 0, is secured to the collar, and presses against thelocking-lever to keep it in proper position. The locking-lever F extendsacross the face of the driving-pulley, and is bent to avoid the axle, sothat its ends may always be nearly diametrically opposite each other.The axle thus serves as a stop to limit the movement of the lever, andprevent its being carried too far around by the balance-wheel and bythis means we are enabled to form the groove in the wheel of lessdiameter, and thus lessen the distance to be traveled by thelockinglever. The end of the lever opposite the arm f is provided withanother arm, f which projects into an annular groove, g, that is formedin the face of the hub of the balance-wheel G. The arm f on thelocking-lever is formed in a peculiar manner, of a rectangular shape,and having projecting edges f f 2 at two of its obliquely oppositeangles, so that the shortest distance between these angles is greaterthan the distance between the other two angles of the arm. When the longaxis of the arm is placed crosswise in the slotg by the action of thelever, the projecting edges are jammed againstthe walls of the slot, andthe balance wheel is revolved in the same direction as thedriving-pulley, When the driving-pulley is moved in the oppositedirection the short axis is thrown crosswise in the slot, and as thedistance between these angles is not sufficient to jam them against theoppositewalls ofthe slot by the limited action of the lever, thebalancewheel is released from the drivingpulley and free to continue itsrevolution un til its momentum is overcome. The balancewheel, whenstarted by the drivingpulley and locking-lever, has a tendency to movewith an increasing velocity relatively to the driving;

pulley, because of its greater diameter and weight, and its continuousrotation, and, but for the peculiar form of the lockingdever, would beretarded in its action,

When the lever is constructed as above described, it is evident thatwhen the balancewheel moves at a greater velocity than the pulley thepulley causes the short axis of the arm f to cross the slot in the hubof the wheel, and releases it from the drivingpulley. We are thusenabledto secure a very high degree of velocity of the balance-wheelwithout much efifort upon the treadle, or a continuous and correspondingdegree of velocity of the drivin g-pulley and by the arrangements andcom binations above described we are enabled to secure adevice that ispositive in its action, that is either instantly 'griped or released bythe locking mechanism, and that is not liable to be accidentally lockedand wedged by unusual strains.-

A further description of the operation is unnecessary.

A suitable spring or retracting mechanism may be employed for raisingthe treadle when it is depressed by the operator, and africtionbrakemay be applied to the balance-wheel to retard or stop its motion whendesired; but these form no part of our invention, and need not be shownor further described.

We claim as our invention-- 1. The combination of the vibratingbifurcated treadle, the driving-belts passing in opposite directionsaround the driving-pulley, the pulley actuated by the belts and carryingthe lockingdevef with its projecting arms, that act upon the hub of thepulley, as described, and the balance-wheel with its concentric groovein the face of the hub, all these parts being constructed for jointoperation, substantially as and for the purpose described. 2. Thecombination of the drivingpulley, rotating alternately inoppositedirections, the loching-leverextending across the face of the pulley,and having an arm with projecting edges formed upon two of its angles,and the balance-wheel, with a concentric groove formed in the face ofits hub, all these parts being constructed substantially as and for thepurpose specified,

3. The combination of the axle, the reversible driving-pulley, thegrooved wheel, and the locking-lever extending across the face of theWheel, all these parts being constructed and operating as described, sothat the axle forms a stop to limit the play of the lever, as set forth,

In testimony whereof we have hereunto subscribed our names.

JOHN BARNES.

W. F. BARNES.

Witnesses:

J. G. MANLOVE, EZRA CARPENTER.

